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问题 单项选择题

客货共线铁路车站，正线与其相邻到发线间最小距离，当v≤120km/h，一般情况下为（）mm。

A.4000

B.4600

C.4800

D.5500

答案

参考答案：D

单项选择题

Michael Vincent and Elizabeth Matthews, economists at Macro Associates, conduct research into the effects of fiscal policy on the economy. Vincent states that government taxing decisions affect the supply of labor. Matthews contends that government taxing decisions affect potential GDP. Regarding the statements made by Vincent and Matthews: Vincent Matthews（）①A. Correct Incorrect ②B. Incorrect Correct ③C. Correct Correct

A. ①

B. ②

C. ③
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单项选择题

对气雾剂的叙述错误的是（）

A.气雾剂是由抛射剂、药物与附加剂、耐压系统和阀门系统组成

B.气雾剂可分为溶液型、混悬型和乳剂型三种类型

C.药物可溶于抛射剂及潜溶剂者，常配制成溶液型气雾剂

D.药物不溶于抛射剂或潜溶剂者，常以细微颗粒分散于抛射剂中

E.乳剂型气雾剂在容器内呈乳剂，抛射剂是外相，药液为内相
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